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Furnace short cycling is frequently mentioned in this forum as not being energy efficient. I have a Honeywell thermostat that can be set to 3 or 6 cycles per hour. (Currently set at 3 cycles). Are either of these considered short cycles?

Maybe I should have asked if a 10 minute run time is considered a short cycle.

3 cycles per hour is a good setting. A short cycle would be less than 5 minutes during minimum demand IMO. During extreme outdoor temperatures(depending on design temp), the furance should run nearly constantly. A 2 stage system runs normally on 1st stage, but when extra heat is needed for it to maintain the temp setting, the tstat will bring on the 2nd stage. 2nd stage should only run during peak demand. A normal cycle should consist of a long run on 1st stage.